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Old 11-26-2020, 06:57 PM   #1
Norris McCarty
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Default “Inside” part of road draft tube

Where can I buy the part of a road draft tube that comes up from the block up to the intake manifold? My 53 Merc is running an early Navarro manifold so there’s no road draft setup.
I pulled the manifold today in order to install a PCV setup under the manifold and found that the tube in the lifter valley had previously been removed.
I’ve looked, but can’t seem to find that tube for sale anywhere.
Even if I went with a late model manifold I’d need the tube.
I suppose I could find a freeze plug the correct size to fit the hole in the block and weld a fitting for the PCV line on it but I’d much rather find the tube that should be there to weld a cap on and T a fitting to connect to the PCV valve that’s connected to the underside of the manifold.
Thanks
Norris

Last edited by Norris McCarty; 11-26-2020 at 09:30 PM.
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Old 11-26-2020, 07:29 PM   #2
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Default Re: “Inside” part of road draft tube

Norris try the swap meet section here. Click link above and do a search.
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Old 11-26-2020, 07:51 PM   #3
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Default Re: “Inside” part of road draft tube

Thanks....looked there. I also put it in the parts wanted section.
I think the tube has an OD of 1 5/16”.
I don’t imagine many of these got discarded or saved.
Maybe I can find an old block around here....doubtful
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Old 11-26-2020, 08:30 PM   #4
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Default Re: “Inside” part of road draft tube

I probably have one in a bad block around here some where. It’ll take me a couple days to dig it up. I’ll PM you when I find one.......Mark
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Old 11-26-2020, 08:47 PM   #5
Norris McCarty
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Default Re: “Inside” part of road draft tube

Thanks Mark. Since my car is not stock, I may not know what I’m talking about.
Is the tube that comes up though the manifold from the bottom of the lifter valley(hole in right front of block lifter valley)one piece? Is there a grommet where it runs through the manifold?
I was thinking that it runs from the hole in the block to the bottom of the manifold then another pipe attaches to the top of the manifold and then down?
I apologize for my confusion.
Thanks
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Old 11-26-2020, 09:02 PM   #6
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Default Re: “Inside” part of road draft tube

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This is a road draft tube:

https://www.fordbarn.com/forum/showt...ght=Draft+tube

Saw in swap section.
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Old 11-26-2020, 09:13 PM   #7
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Default Re: “Inside” part of road draft tube

I don't believe that is what he's looking for. When you remove a proper intake manifold from an 8BA, there is a straight vertical pipe about 5" long the fits into a hole in the valley and also into a matching hole on the bottom of the intake manifold.

I think that's what he needs, as it appears that someone removed the original to be able to run an early manifold. If I am wrong, well, I'm wrong.
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Old 11-26-2020, 09:25 PM   #8
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Default Re: “Inside” part of road draft tube

Ok, all I need is the tube that goes into the hole in the right front of the lifter valley. My early Navarro manifold does not have a hole in it for the road draft tube. I’ll be cutting and capping the tube off 4” or so above the lifter valley so I can put a fitting and hose on it to go to a PCV valve that’s tapped into the bottom of the intake manifold for vacuum.
Here’s the hole:
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File Type: jpg 98849FB9-C244-44EB-923B-570EEF3A06A7.jpg (72.1 KB, 44 views)
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Old 11-26-2020, 09:26 PM   #9
Norris McCarty
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Default Re: “Inside” part of road draft tube

Correct TUBMAN.....Thank you
Here’s what I’m trying to do:
https://www.jalopyjournal.com/forum/...ve2-jpg.24680/
Not my picture.....just a pic of what I want to do.

Last edited by Norris McCarty; 11-26-2020 at 09:57 PM.
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Old 11-26-2020, 10:05 PM   #10
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Default Re: “Inside” part of road draft tube

If you have an original road draft tube, a portion of it can be reworked to fit.
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File Type: jpg draft tube.jpg (48.2 KB, 400 views)
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Old 11-26-2020, 10:08 PM   #11
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Default Re: “Inside” part of road draft tube

Thanks.....I don’t, but can probably find that piece and build one if I have to.
I would not have known that if you hadn’t brought it to my attention!
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Old 11-26-2020, 10:40 PM   #12
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Default Re: “Inside” part of road draft tube

There is a website called "OnlineMetals.com" that sells small quantities of metal products for reasonable prices. You may be able to find what you need (1 15/16" steel tubing?) there. I would also suggest trying to find a steel "Freeze Plug" the proper size to cap the tube off. There is a site called "FreezePlugFactory.com" that will probably have what you need, but unfortunately they are not "small quantity friendly". You might also try your FLAPS or maybe Dorman.

EDIT : It looks like 1 5/16" is not a standard tubing size. Your best bet is to find an original. I am sure someone on here has some laying around. I probably do, but it would probably take me days to find it. A "cup" freeze plug is probably still a good idea to cap it off.

Last edited by tubman; 11-26-2020 at 10:51 PM.
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Old 11-26-2020, 10:50 PM   #13
Norris McCarty
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Default Re: “Inside” part of road draft tube

Thank you sir!
It’s 1 5/16” best I can measure in that hole!
That just reminded me that I have some snap gauges.
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Old 11-27-2020, 02:24 AM   #14
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Default Re: “Inside” part of road draft tube

.

Hey Norris....."Heard" and I just finished doing a PCV valve on his new 8BA with an 'early' intake manifold. You're correct.....there is an internal tube that originally goes from bottom to top. One twist that we decided to overcome was to devise a way to hide the PCV valve, yet have the ability to service or replace the valve WITHOUT the need to remove the manifold.

We cut that vertical tube roughly in half. There is a DORMAN freezeplug that fits tightly into the top of that tube, into which we drilled an appropriate hole to accept a bulkhead fitting with a compression nut and ferrule for the copper tubing. Click the link below for our entire thread with a parts list, including that DORMAN freeze plug number........plus a lengthy description of our process....plus lots of pictures. You'll find a tube shortly....I can't believe "tubman" doesn't have half a dozen of those laying around on the floor!! Good luck!! DD


https://www.fordbarn.com/forum/showthread.php?t=284487








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Old 11-27-2020, 05:35 AM   #15
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Default Re: “Inside” part of road draft tube

Not sure if I should pirate this string but it lines up with a question I was going to post. So will give it a shot. What size PCV valve do you guys use? Or, how do I know if I am getting enough air flow? I have a 1950 8BA, I used my original draft tube assembly and drilled a hole in the tube and treaded in a hose nipple. Then capped off the original draft tube at the bottom. From the new nipple I ran a rubber hose to catch can then to a PCV then to the manifold. The plumbing all seems to work out. But I don't know if I am getting proper flow through it. I'm not pulling a notable vacuum in the crankcase. I used a heater hose to make a sealed fitting on the dipstick.

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Old 11-27-2020, 05:54 AM   #16
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Default Re: “Inside” part of road draft tube

Quote:
Originally Posted by msstring View Post
Not sure if I should pirate this string but it lines up with a question I was going to post. So will give it a shot. What size PCV valve do you guys use? Or, how do I know if I am getting enough air flow? I have a 1950 8BA, I used my original draft tube assembly and drilled a hole in the tube and treaded in a hose nipple. Then capped off the original draft tube at the bottom. From the new nipple I ran a rubber hose to catch can then to a PCV then to the manifold. The plumbing all seems to work out. But I don't know if I am getting proper flow through it. I'm not pulling a notable vacuum in the crankcase. I used a heater hose to make a sealed fitting on the dipstick.

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This is the way I checked for vacuum using the oil fill tube as the source.


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Old 11-27-2020, 09:20 AM   #17
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Default Re: “Inside” part of road draft tube

Thanks V8COOPMAN. I needed that!
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Old 11-27-2020, 03:15 PM   #18
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Default Re: “Inside” part of road draft tube

FYI the original p/n for the tube is 8BA-6759. Google didn't find any but Dennis C. may have it in their stash of NOS parts.

The oil fill tube for an 8BA is 1.3695 OD, might be worth trying, those are widely available.
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Old 11-27-2020, 03:25 PM   #19
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Default Re: “Inside” part of road draft tube

Thanks Ross!
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Old 11-27-2020, 03:54 PM   #20
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Default Re: “Inside” part of road draft tube

Can you make that internal tube using a piece of copper tubing or a sink drain pipe?
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